Tight closing butterfly valve



pril 26, 1960 s. P. KINNEY ETAL TIGHT CLOSING BUTTERFLY VALVE:

2 Sheets-Sheet 1 Filed Nov; 2, 1955 IN VEN TOR. SELWYNE P. KINNEY.

CORNELIUS J GAR'RIGAN W hr. QLA RKE.

Hue/ B. Corr- ATTORNEYS.

United States Patent 2,934,310 TIGHT CLOSING BUTTERFLY VALVE Selwyne P.Kinney, Crafton, Cornelius J. Garrigan, Greentree Borough, and Ward W.Clarke and Hugh B. Carr, Pittsburgh, Pa., assignors to S. P. KinneyEngineers, Inc., Carnegie, Pa., a corporation of PennsylvaniaApplication November 2, 1955, Serial No. 544,394 9 Claims. (Cl. 251-163)This invention relates to valves of the type known as butterfly valves,and is for an improvement in such valves in which the movable valveelement may be effective to used in locations where the flow of fluidmust be completely closed off. This is due to the fact that such a valveis like an ordinary stove pipe damper involving a circular disk ordamper carried on a shaft extending diametrically across the interior ofa circular pipe or housing. The valve element or damper rotates throughan arc of 90 about the axis of the shaft from a position where it istransverse to the passageway or pipe in which it is located to aposition where it lies parallel with the axis of the pipe. Since it mustrotate within the pipe or passageway, its diameter must be slightly lessthan the interior diameter of the pipe or housing in which it ispositioned. Hence, there can be no seat against which it makes a tightseal, as such a seat would interfere with the turning of the valveelement or damper. Since the damper cannot close against a seat, such avalve cannot be fluid tight.

A primary object of the present invention is to provide a butterflyvalve wherein the valve passage is provided with a seat against whichthe damper will tightly seat and to provide a damper and operatingmechanism permitting the use of such a seat.

Further objects of the invention are to provide a butterfly valve with areplaceable seat, and to provide a novel operating means between thedamper and valve shaft so as to move the valve element or damperrectilinearally in addition to rotating the same whereby it may thrustagainst the seat in closing the valve or be moved away from the seatupon opening of the valve a distance suflicient to clear the seat beforethe damper rotates to the full open position.

These and other objects and advantages are attained by our invention,which may be more fully understood in connection with the accompanyingdrawings which show certain embodiments of our invention, and in which:

Fig. 1 shows a rear elevation of the valve and damper operatingmechanism;

Fig. 2 shows a cross section through the valve with the damper insealing position;

Fig. 3 shows a view similar to Fig. 2 with the damper at the end of itsstraight linear movement ready for rotation into the position shown bydotted lines;

Fig. 4 shows a section similar to Fig. 2, but on a larger scale andshowing a portion only of the entire valve body, this view shows amodification;

Fig. 5 is a fragmentary section of the mechanism of Fig. 4, but with thevalve open; and

Fig. 6 is an elevation of a portion of the cam and housing shown in Fig.5.

Referring now in detail to Figs. 1 to 3 of the drawings, the valve bodyis preferably comprised of two hollow cylindrical portions 1 and 2. Theportion I having a web 3 terminating at its outer end in an outstandingflange 4 and at its inner end in an outstanding flange 5. The innerperiphery of flange 5 has a recess therein to receive the head 6 of acircular sealing gasket which may be rubber and has a plate portion 7extending between the adjacent flanges of the portions 1 and 2. Thesealing gasket may be of rubber, rubber-like material, or metal such asbrass or some composition, depending upon the use to which the valve isto be put. The gasket head 6 has an outwardly inclined or beveled edgeforming a seat for the valve damper. The valve portion 2 comprises a webportion 8 terminating at its inner end in an outstanding flange 9 and atits outer end in an outstanding flange 10. The inner end portion 11 ofthe valve portion 2 has an inside diameter greater than that of valveportion 1 and the beveled face of gasket head 6 terminates in alignmenttherewith. The outer end portion 12 of valve portion 2 has an insidediameter greater than portion 11 to permit rotation of the valve damperas hereinafter described. The portions 11 and 12 are connected by asuitable portion 13. The adjacent flanges 5 and 9 have the gasket plateportion 7 disposed between them and are connected together by aplurality of bolts 14. The flanges 4 and 10 having a plurality of boltopenings therein for connection to the flanges of a pipe line or otherconduit within which the valve is mounted.

The valve damper 15 is a flat circular member having a diameter slightlyless than the inside diameter of the valve body web portion 11 and onits rear face 16 has a beveled peripheral portion corresponding to thebevel of the head portion 6 of the sealing gasket. A valve damperoperating shaft 17 extends transversely of valve body portion 2 andthrough the walls of web portion 12 in spaced relation to damper 15.Guide members 18 are spaced longitudinally of shaft 17 and provided atone end with a portion 19 secured to damper 15 in any suitable manner.The opposite ends of members 18 are bifurcated as at 20 for slidablyembracing shaft 17. A rib 21 is mounted on damper 15 adjacent each guide18. A pair of link members 22 are pivotally mounted at one end on eachrib 21 by means of pin 23. Cam members 24 are mounted on shaft 17between the pairs of links 22 and pivotally connected thereto by pins25. Each cam is suitably connected with shaft 17 in any suitable manneras by pins 26 for concurrent rotation therewith. A tension spring 27 isconnected with each pair of links 22 and with the adjacent guide member18 by any suitable means such as pin 28 in guide member 18 and pin 29 inlink 22'. The shaft 17 may be mounted on valve body member 2 in anysuitable manner, as by having its end portions journaled in bearings 30and 31 which may be cast integral with the member 2. Preferably thesebearings are provided with lubricating fittings 32. The shaft 17 extendsthrough bearing 31 and an operating handle 33 is mounted thereon forrotation of the shaft.

During operation of the valve, it may be mounted by means of flanges 4and 10 in any suitable pipe line, stack or other form of conduitcarrying the gas or gases to be controlled thereby. The valve damper inclosed position is shown in Fig. 2 of the drawings wherein the damper 15has its front face 15 seated in sealing position upon the seat 6 of therubber gasket between the valve body portions 1 and 2. The flow of gasesthrough the valve is in the direction of the arrow of Fig. 2 and anypressure thereof assists in holding the damper seated on its gasket 6.The valve handle 33- is first rotated into position marked retracted onFig. 3 imparting rota tion to shaft 17. During rotation of shaft 17 thecam 24 acting through links 22 imparts a linear movement to damper 15relative to portion 11 of valve body 2 moving the damper from theposition shown in Fig. 2 to that shown in full lines on Fig. 3. Duringthis damper movement the guides 18 have a linear movement relative toshaft 17 disposed within the bifurcations 2d of the guides. When thedamper is positioned as shown by full lines in Fig. 3, it is free torotate relative to the valve body 2. By reason of shaft 17 being seatedon the rear ends of the bifurcations 23 of guides 13, the cam 24rotating concurrently with shaft 17 imparts a rotary movement to damper15 as operating handle 33 moved from retracted to open position asindicated on Fig. 3. When in fully open position damper is disposed at90 to its closed position as shown by dotted lines in Fig. 3. Duringrotation of valve handle 33 from open to closed position, the damper 15first rotates from the position shown by dotted lines in Fig. 3 to thatshown by full lines, or from a horizontal to vertical position as viewedin Fig. 3. Further rotation of shaft 17 causes cam 24 acting throughlinks 22 to move damper i linearly of valve portion 2 until the damperseats against gasket head 6 as the operatinghandle reaches closed"position. During the latter linear movement of damper 15, springs 2.7acting through links 22 position the damper within the valve body so asto seal against gasket head 6.

In the construction shown in Figs. 4, 5 and 6 the .valve body, seat andshaft are constructed as hereinbefore described, but we have shown adifferent eccentric arrangement for effecting rectilinear and swingingmovement of the damper.

In these figures, the valve disk or damper 35 in closed position, asshown in Fig. 4, seats against the seat, designated 6. instead of thedamper having ribs and links at the back, it is provided with a camhousing bolted thereto. The shaft 37, corresponding to 17 in Fig. 1, isprovided With one or more eccentric cams 38 that are confined in thehousing between a bearing plate 39 on the back of the valve and abearing plate 40 in the housing.

To one side of the cam, the housing is provided with internal abutments41 and 42. A pin 43 passing through the shaft has a projecting end whichin closed position of the valve is near or adjacent the abutment 4-1. Inthe closed position, shown in Fig. 4, the high part of the cam 33 ispressing against the bearing plate 39, holding the damper against theseat. To open the valve, the shaft is rotated through an arc of 180 andas it does so it exerts pressure against the surface 40, retracting thevalve damper rectilinearly away from the seat. When it has been thuswithdrawn, it will clear the valve seat when it rotates to horizontalposition. After the damper has been so withdrawn, the pin 43 contactsthe abutment 42 and the damper is rotated to horizontal position, shownin Fig. 5.

When the damper is in horizontal position it cannot tilt back because ofthe contact of lug 42 with the pin, and the cam is so shaped thatfurther clockwise movement tightens the engagement of the surface 40against the cam. Therefore the damper cannot tilt out of position whenit is opened, except by turning the shaft. When the shaft is turnedcounterclockwise, the damper will be tight enough against the cam toturn with it. When the damper is back in vertical position and contactsthe 811- face 11a, the cam will turn in its housing and exert pressureagainst the plate 39 to move the damper 35 IDLO ti h seatin osition.

Iii each f of m shown, the area of guide surface 11 in the valve body iswider at the bottom than at the top, so that when the valve damper isvertical upon being moved to the closed position, it cannot swingm thereverse direction and must thereafter move rectihnearly.

Our invention, in providing a butterfly valve w th a damper turningmechanism that imparts a rectilinear movement to the damper in theinitial opening or final closing of the valve, enables an internalannular seat to be provided in the'body and permits the valve damper tobe shifted to a point wherein its turning movement the periphery of thedamper clears the seat. It provides therefore a butterfly valve which istight closing.

While we have shown and described certain embodimerits of our invention,it will be understood that various changes and modifications may be madein the construction and arrangement of parts within the contemplation ofour invention and within the scope of the appended claims.

1. In a butterfly valve of the character described in combination, ahollow openended housing having a longitudinally extending restrictedportion therein having diametrically opposite portions of differentlinear dimension, a damper disposed transversely of said restrictedportions and movable linearly thereof, a damper sealing member mountedadjacent one end of said restricted housing portion, a rotatable memberdisposed transversely of said housing outwardly of the opposite end ofsaid housing restricted portion, and means connected with the damper andwith the rotatable member for sequentially imparting reciprocal linearmovement to the damper between said diametrically opposite housingrestricted portions and rotary opening and closing movement to thedamper after linear movement to the end of the shorter of said housingrestricted portions adjacent said rotary member.

2. The butterfly valve as defined in claim 1 wherein the longer of thevalve body restricted portions prevents rotation of the damper past aposition substantially normal to said restricted portions as the valvemoves from open position toward sealing position.

3. The valve as defined in claim 1, wherein said means comprise ahousing secured to one face of the damper and extending therefromoutwardly from between said valve housing restricted portions, saidhousing receiving said rotatable member, a cam member fixed on said totatable member and having diametrically opposite faces engaging saiddamper and said housing, and projecting portions on said rotatablemember and said damper housing limiting relative rotation between saidcam member and housing.

4. The valve as defined in claim 3 wherein said housing projectingportions are radially disposed about said rotatable member and said camis disposed longitudinally of the rotatable member relative to saidhousing projecting portions.

5. The butterfly valve as in claim 1 wherein said means includes a guidemember rigidly mounted on the damper in engagement with said rotatablemember and selectively movable relative to the rotatable member as thedamper moves into and out of sealing position.

6. The butterfly valve as in claim 5 wherein, a cam member is mounted onthe rotatable member for rotation therewith, a link pivotally connectsthe cam and damper, and a resilient extensible member connects the linkand guide for positioning the damper during return from open to sealingposition.

7. The butterfly valve as in claim 6 wherein the link has a bearingengagement with said rotatable member when the damper is positioned forconcurrent rotation with said rotatable member.

8. The butterfly valve as in claim 7 wherein the damper has peripheralengagement with the housing when in sealing position.

9. The butterfly valve as in claim 1 wherein the said means comprises abracket mounted on the damper and extending in a direction towards therotatable member, one end of the bracket having a bifurcated portionwithin which the rotatable member is disposed during all positions ofthe damper, a cam mounted on the rotatable member adjacent one side ofthe bracket and connected.

to the rotatable member for concurrent rotation therewith,

a link member having one end pivotally connected to the 1,213,513 LohseJ an. 23, 1917 cam in spaced relation to the rotatable member and the1,504,288 Vencl Aug. 12, 192A opposite end pivotally connected with thedamper, and 2,655,942 Dougherty Oct. 20, 1953 a tension spring connectedat one end to the bracket and 2,67 3,061 Broz Mar. 23, 1954 :tf theother end to the link intermediate the ends there- 5 FOREIGN PATENTS496,005 France July 18, 1919 References Cited in the file of this patent605,688 France Feb. 20, 1926 UNITED ST P 621,195 Great Britain APY- 1949373,000 Zehren Nov. 8, 1887

